Pneumatic hammer



W. H. WINEMAN PNEUMATIC HAMMER Filed Oct. 26, 191B 43 E invasivi-05". wwdell waineiuam Patented @et 2l, 1924.

NETE@ STATES pensee amaai" carica..

WADE H. WINEIVIAN, OIF CHICAGO, ILLINOIS,` ASSIGNOR TO SULLIVAN:MACHINERY COMPANY, A CORPORATICN OF MASSACHUSETTS.

PNEUMATIC Application filed October 2G, Y1918. Serial N'o; 259,789.

To all whom 'it may] concern.'

y Be it known that I, lVADn H. VINEMAN, a citizen of the United Sta-tes,residing' at Chicagdinthe county of Cook and State 5 of Illinois, haveinvented certain new and useful Improvements in Pneumatic Hammers, ofwhich the following is a full, clear, and exact specification. f

This invention relates to pneumatic'hammers, and more particularly tothe pneumatic hammers used in drill sharpeners for operating the upperswaging die, the object of the present invention being to provide ameans for controlling the hammer and a mechanism operably attached tothe ha1n mer controlling means for normally holding the upper swagingdie in an elevated position. In aftypeof drill Sharpener now eX-tensively used, the swaging dies are placed substantially in alinementwith the upsetting mechanism, necessitating the holding of the upper diein an elevated position to permit a clearance between the dies so thatthe upsetting mechanism is readily accessible to F the operator. It isone of the objects of this invention to provide an automatically actingmechanism for retaining` the dies separated so that while working thesteel the operator may change from the swaging to the upsettingoperation without having to perform the intermediate operation ofseparating the dies and insertingsome means for holding the diesseparated. These and other objects and advantages of my improvedconstruction will hereinafter more fully appear.

-in the accompanyng drawings, I have for purposes of illustration shownone embodiment which my vinvention mav assume in practice.

In these drawings,-

Fig. 1 is a -front elevation of a drill sharpener embodying myinvention.

Fig. 2 is a side elevation of the die operating mech-anism. Y Y

Fig. 3 is a longitiudinal sectional vview of the inlet valve.

Fig. i is an enlarged end View of the upper rockshaft and thecontrolling means attached thereto.

Fig. 5 is a vertical central section through the cylinder and valvemechanism of the die operating motor. f

Referring to the drawing `and to the Inachine shown therein, while theinvention may be embodied in machines and devices other than thespecific type herein shown, for the sake of illustration there is shownone embodiment of thefinvention in a drill Sharpener 1, having a base 2on which is secured a lower swaging die 3. Bolted to the base at l is anupright support 5 for supporting in a vertical position a pneumatichammer 6 for operating the upper swaging die 7.

The upperfswaging die 7 reciprocates in a vertical guide 8 formedintegral with the support 5.

A ootflever 9 is attached to one end of a the other end of the rockershaft carrying a lever 11 for actuating a vertically disposed-A rod 12which controls a rvalve mechanism and a die holding mechanism in amanner to be hereinafter/described. A spring 18 `is held under partialcompression between a flange on the support 5 and a collar on the valverod, tonormally hold the valve -rodV in an elevated position. y

The upper swaging die is reciprocated by a piston rod 14 carried on thelower end of a piston, adapted to reciprocate in a cylinder 15 of a`pneumatic hammer 6. A valve chamber 16 is'mounted on the side of thehammer 6k and encloses a valve for directing the flow .of pressure uidalternately to the opposite ends of the piston in a manner well known intheart.

The flow of pressure fluid 'from any suit,- able source, as a pressuretank, througha pipe 17 to the valve chamber' 16,*is controlled by anormally closed valve mounted adjacent the valve chamber. This valve.

comprises a. casing 18 provided with internally threaded, oppositelydisposed portions 19 whereby the same may be connected to the pipe 17and to a short pipe 20 leading to thev valve chamber 16. A partition 21divides the valve casing 18 into two substantially equal parts andcarries substantially centrallyr of the casing a valve seat-22. Aprojection 23 is cast on the lower side of the casing 18 and ,isprovided with external threads, or other suitable means, whereby arockerfshaftV 10, passing through the base 2,

boss 24 is secured in alinement therewith.

Also mounted on theyvalve casing 18, but diametrically opposite theexternally threaded projection A3, is an internally threaded collar 25adapted to receive a screw plugk 26 provided with a cylindrical recessl27 passing part way through the plug and openingV into the valvechamber. Holes are provided cent-rally of the members 23 and 24 and inalinenient with the valve seat 22 and recess 27 to receive a valve pin28 and a valve actuating rod 29, the latter being provided with a head30 adapted to contact with the valve pin 28. n A valve member 31 ismounted on the valve pin near the upper end thereof and is normally heldin contact with the valve seat 22 by a spring 32 which abuts against thevalve member andscrew plug 26 and which is held in position by the upperend of the valve Vpin which passes centrally through the spring.

Journaled in bearings secured to the supportV 5 is asecond rock shaft 33provided at one end with an arm 34 operatively connectled by means of alost motion connection 35 with the valve controlled rod 12 through alink' 36, the rock shaft vbeing further provided kat its other end withan eccentrically mounted pin 37, carrying one end of the valve actuatingrod 29. As shown, this rod 29 is made in two parts, the upper part beingthreaded into the lower and being held against relative movementtherewith by a lock nut 29. This construction permits of an adjustmentin the length of the rod so that the different members may be adjustedto preserve their proper relation and to permit the valve to seat. f

Intermediate the ends of the rock shaft and rigidly secured thereto is adog or pawl 38 adapted to rest in a depression in the upper die r7 insuch a manner that it holds the die against downward movement. Theweight of the -valve actuating rod 29 normally tends to rotate the rockshaft counterclockwise to bring the pawl against the swaging die soitwill fall into vthe depression formed therein. The lost motionconnect-ion permits the rocker shaft to rotate independently of thevalve control rod 12, so that when the swaging die moves upwardly andstrikes the pawl thev rocker shaft will rotate sufficiently to permitthe pawl to slide over the edge of the die and fall into the depression,as has .been described. A third rocker shaft 39 rotatably mounted in aprojection 40 formed on ythe hammer or its support, is actuated by anarm ,41 rigidly connected to the shaft and Vconnected by a pin to theupper end .of the control rod 12. The other end of this rocker shaftcarries a lever 42 in which is a depressionfor receiving one end of apin 43 which passes upward through the lower head of the valve chest 16.Then the rod 12 is raised, this pin 43 forces the hainmer controllingvalve in the valve chest 16 intoitsextrenie raised position, so as todirect a flow of pressure fluid tothe under side of the piston to forcethe piston upward and temporarily hold itelevated.

When the operator kdesires to use the swaging mechanism, he depressesthe foot lever 9 which operates thecontrol rod 12 and causes the link torotate the rocker shaft 33 in a clockwise direction and so frees theupper die by raising the pawl from con# tact therewith and also opensthe valve 18 yto permit a flow of pressure fluid to the hammer toactuate the piston. The downward movement of the control rod rotates therocker shaft in a clockwise direction to permit the pin 43 to fall sothat the valve in the chest 16 can perform its normal functions. Y

1IWhen the o ei'atorieiiioves his foot from the lever 9, t e control rodis forced upward, the lost motion connection breaks the control on therocker shaft 33, which rotates counter-clockwise under the weight of thevalve actuating rod 29, and so brings therpawl 38 into the path of thereciprocatnature that several eventsoccur in a specific time relation.Let it be assumed that rthe hammer has been operating, that the pawl'38is moved out of the path of the die7, that the plunger'43 is movedbeyond the path of travel of the distributing valve in the valve chest16, and that the valve 31 is unseated. Thesequence of events in stoppingthe hammer will be as follows: As the operators foot is removed from thepedalV 9 yand the rod 12 moves upwardly, Ythe member 42 forces theplunger 43 intoV engagement .with the valve and so discontinues thereciprocation of the piston'which operates the die 7 and brings the dieto raised position. As this is accomplished, the pawl 38 which has beenreleased drops into the notch in the side of the die 7, which it canread-ily do by reason of the raised position of the die, andsimultaneously the valve 31 finally cuts off pressure supply yand socloses down the hammer. It will be .IiOed from Eig, 4, in which theposition of Vthe parts is that ,corresponding to a time when the pawlYisheld out of the notch in the die 7 and when the hammer is operating,that the pin 37, which determines the position of the valve 31 by meansof theV plungers 29 and 28, is nearly in line between the axis of therock shaft 33 and the valve 31. It will therefore be noted that, as thearm 34 moves upwardly, the valve 31 will be closed at first only verygradually and that accordingly while there will be throttling of thesupply of air to llHl lUS

lli)

ythe top of the die 7 With the member A38 Willy cause a momentaryreopening of the valve 3l whereby to effect the` admission of a finalsmall quantity of fluid to carry through the upwardfmotion of the pistonand die `7 withoutreleasing the distributing valve fromiit's raisedposition. Thus 1t 1s seen that I have devised a simple and efficientmeans for noi'- mally retaining the upper syvaging vdiein an elevatedposition, and means :tor casus-ry ing the die holding mechanism tooperate when the fluid pressure is cut ofi from the pneumatic hammerwhich operates the die.

While I have herein shown and described, for the purpose of.illustration, one specific form of the invention, it is to be understoodthat the same has been shown for illustrative purposes only and thatextensive deviations may be made from the disclosed form thereof Withoutdeparting from the spirit of the invention.

Vilhat I claim as new and desire to secure by Letters Patent is:

1. In a drill sharpener, the combination with swaging means comprisingstationary and movable dies and a fluid pressure motor for actuatingsaidmovable die, of controlling means for said motor operative to causeraising of said die prior to the shutting down of said motor, andautomatic mechanical means adapted to engage said de and hold itinraised position, said controlling means being operative to entirelydiscontinue supply oit' fluid pressure to said motor when said die isheld stationary in raised position.

2. In a drill Sharpener, the combination with swaging means comprisingstationary and movable dies and a fluid pressure motor for actuatingsaid movable die, of control means for said Sharpener comprising a valveadapted to control the supply of pressure fluid to said motor,mechanical means normally extending into the path of said movable dieand operative when so extended to hold said die in raised position, andcontrol mechanism ior said valve and said mechanical means operative inone position to open said valve and Withdraw said holding means and inanother position to permit said holding means to extend into the path ofsaid movable die and said valve to close, said control mechanismincluding a mechanical interconnection whereby said valve may bemomentarily opened upon engagement of said holding means by said dieupon upward movement of the latter.

3. In a drill Sharpener, the combination of swaging means comprisingstationary and movable dies and a fluid pressurejmotor for actuatingsaid movable die, said motor having a valve automatically operative tosupplyy pressure in alternation to opposite ends of said motor and tocontrol the eX- haust offfluid therefrom, of control means l for saidSharpener comprising a member adapted to engage said valve and move itinto position to cause raising of said movable `die, a stop valveadapted to control the supply of pressure fluid to said first mentionedvalve and to the motor, mechanical ymeans normally extending into thepath of sa-i'd'movable die and operative When so eX- tended to hold saiddie in raised position, and operating mechanism comprising a memberoperative 'when moved inone direction to release said first mentionedvalve, to open said second mentioned valve, and to Withdraw said holdingmeans, and in another position to move said first mentioned valve to aposition to effect raising of said movable die, to close said secondmentioned valve, and to permit said holding means to extend into thepath of said movable die, said operatingmechanism including a mechanicalinterconnection whereby said second mentioned valve may be opened uponengagement of said holding means by said die on upward travel of thelatter While said first mentioned valve is maintained in stationaryposition.

4C. In a drill Sharpener, a die, means including a fluid pressure motorfor operating said die, a valve controlling said 'motor, means forholding said die stationary, and means connecting said valve and saidholding means to close said valve entirely when said die is heldstationary.

5. In an apparatus of the `character set forth, coacting die means, amotor for operating the same, means for supplying motive fluid underpressure to the motor, means for distributingsaid motive fluid thereinto repeatedly actuate said motor, means to control said second mentionedmeans to maintain one of said die members in one position, mechanicalmeans coacting there- With to lock said die in said position, and commoncontrol means having a. lost motion connection with said last mentionedmeans and controlling the operation of all of said means.

6. In an apparatus of the character set forth, coacting die means, amotor having a piston for operating the same, means for controlling thesupplying of motive iluid kunder pressureV to the motor and fordistributing it therein to cause said motor piston to be repeatedlyactuated to cause repeated relative movements of said dies, mechanicalmeans operable to maintain one of said die members in one position, andcontrolling means for said several means operative to effect movement ofsaid die to said position, operation of said mechanical means to hold ittherein, and linterruption lof the fluid supply to the motor.

7. In an apparatus of the character set l`forth, coacting die means, amotor having a piston for operating one of the same,

. meansfor controlling the supplying Of Inomeans operative in fixedsequence on'aotualtion thereof to effect movement of said die to saidposition, operation of said mechanical means to hold it therein, andinterruption of the Huid supply to the motor.

. ture.

8. In an apparatus of the Acharacter set forth, an anvil, a movablehammer cooperating therewith, means includingv la, fluid pressureactuated piston for causing said hammer to strike a Work piece on saidAanvil a series of blows, means for'controlling the supply of fluidtosaid piston, means for mechanicallyl holding saidhammer in elevatedposition, and controlling. means for said two Y last mentioned meansoperative on aotuation automatically tocause said piston to' raise saidhammer, to cause said holding means to engage the same, andtolinterriipt fluid supply to said piston.

In testimony whereof I `affix'ni'y signa- WADE H. WINEMAN'

